* {
    padding: 0px;
    margin: 0px;
    list-style: none;
    box-sizing: border-box;
}

html,
body,
#app {
    height: 100%;
}

#app {
    .container {
        height: calc(100% - 44px);
        background-color: khaki;
    }

    footer {
        height: 44px;
        background-color: aqua;
    }
}